720° Interval Difference Method
DIAGNOSTIC VALUE
| Diagnostic value | domg 720 = (omg 1 - omg 0) - (omg 7 - omg 6) |
| Misfire judgment | domg 720 > Judgment value → Judge as misfire |
- FTP 1.5 times misfire (Misfire occurrence level which influences exhaust gas)
Judgment Value (Judge that malfunction occurs when the misfire ratio is high in 1000 engine revs.)
JUDGMENT VALUE
| Malfunction Criteria | Threshold Value |
|---|---|
| FTP emission judgment value | > 1.0% in 1000 revs. |
Time Needed for Diagnosis: 1000 engine revs.
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.
- Catalyst damage misfire (Misfire occurrence level damaging catalyst)
Judgment Value (Judge that malfunction occurs when the misfire ratio is high in 200 engine revs.
JUDGMENT VALUE
| Malfunction Criteria | Threshold Value |
|---|---|
| Catalyst damage misfire judgment value | See |
Map 1 Fault criteria threshold for misfire which would result in catalyst damage
FAULT CRITERIA THRESHOLD
| Ignition count | Intake air (g(oz)/rev) | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 0.2 (0.007) | 0.4 (0.014) | 0.6 (0.021) | 0.8 (0.028) | 1.0 (0.053) | 1.2 (0.042) | 1.4 (0.049) | 1.6 (0.056) | 1.8 (0.063) | 2.0 (0.071) | ||
| Engine speed (rpm) | 700 | 148 | 128 | 116 | 106 | 100 | 90 | 90 | 90 | 90 | 90 |
| 1000 | 148 | 128 | 114 | 104 | 92 | 85 | 85 | 85 | 85 | 85 | |
| 1500 | 140 | 118 | 102 | 90 | 85 | 85 | 85 | 72 | 72 | 72 | |
| 2000 | 128 | 90 | 90 | 73 | 58 | 43 | 40 | 36 | 32 | 20 | |
| 2500 | 116 | 87 | 57 | 45 | 39 | 36 | 34 | 32 | 30 | 20 | |
| 3000 | 108 | 87 | 58 | 39 | 36 | 36 | 32 | 30 | 28 | 20 | |
| 3500 | 98 | 74 | 43 | 27 | 23 | 22 | 20 | 20 | 20 | 20 | |
| 4000 | 69 | 61 | 40 | 27 | 22 | 20 | 20 | 20 | 20 | 20 | |
| 4500 | 60 | 55 | 34 | 25 | 20 | 20 | 20 | 20 | 20 | 20 | |
| 5000 | 55 | 55 | 34 | 23 | 20 | 20 | 20 | 20 | 20 | 20 | |
| 5500 | 54 | 54 | 33 | 22 | 20 | 20 | 20 | 20 | 20 | 20 | |
| 6000 | 52 | 52 | 32 | 21 | 20 | 20 | 20 | 20 | 20 | 20 | |
| 6500 | 50 | 50 | 30 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | |
| 6700 | 50 | 50 | 30 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | |
Time Needed for Diagnosis: 200 engine revs.
Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.